Larry Grayson was a camp comedian, very popular on British TV in the 70s and 80s. One of his famous catchphrases was 'What A Gay Day', hence the Daily Star headline of 'What A Pay Day' on the story about a lucky gay couple, Ian Pearce and Lyn Sexton, from Merthyr Tydfil, South Wales, who won £1m on the Lottery.  

!Note - Payday is the day on which wages or salaries are paid.